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門式起重機，也稱為龍門式起重機或龍門吊，是橋式起重機的一種變形，主要用於室外的貨場、料場以及散貨的裝卸作業。它因其場地利用率高、作業範圍大、適應麵廣、通用性強等特點，在港口貨場得到廣泛使用。
menshiqizhongjidejinshujiegouxiangmenxingkuangjia，chengzaizhuliangxiaanzhuangliangtiaozhijiao，keyizhijiezaidimiandeguidaoshangxingzou。zhuliangliangduankeyijuyouwaishenxuanbiliang，zhezhongshejikuodaleqizhongjidezuoyefanwei。genjujiegoutedian，menshiqizhongjikefenweiquanmenshiqizhongji、半門式起重機、雙懸臂門式起重機和單懸臂門式起重機等多種類型。
門式起重機在結構上主要由龍門架、大車運行機構、升sheng降jiang小xiao車che和he電dian氣qi部bu分fen組zu成cheng。其qi中zhong，龍long門men架jia是shi起qi重zhong機ji的de主zhu體ti結jie構gou，支zhi撐cheng起qi整zheng個ge起qi重zhong機ji並bing承cheng受shou各ge種zhong載zai荷he。大da車che運yun行xing機ji構gou負fu責ze起qi重zhong機ji的de移yi動dong，而er升sheng降jiang小xiao車che則ze負fu責ze貨huo物wu的de升sheng降jiang和he搬ban運yun。電dian氣qi部bu分fen則ze提ti供gong動dong力li和he控kong製zhi功gong能neng，確que保bao起qi重zhong機ji的de正zheng常chang運yun行xing。
門式起重機在港口、碼頭、冶金、電力、化工等工業場所都有廣泛應用。根據起重機的外形尺寸與工作性能，它通常分為輕小型起重機、putongxingqiaoshiqizhongjijidadunweitezhongzhuanyongqizhongjihezaochuanyongmenzuoqizhongjidengleixing。qingliangxingqiaoshiqizhongjideqizhonglianghekuadujiaoxiao，duoyongyushineiwaizuoyechangsuodewuliaobanyunzuoyehuoshebeiweixiubaoyangdenggongzuo。
zaishiyongmenshiqizhongjishi，bixuyangezunshoucaozuoguichengheanquanguiding，yiquebaorenyuanheshebeideanquan。liru，duicaozuorenyuanjinxingquanmiandepeixunhejiaoyu，shiqizhangwoanquancaozuochengxu；對起重機進行定期的檢查和維護，確保其正常運行；在操作過程中設置安全屏障和警示標識，提醒操作人員注意安全；以及配備超載限製裝置和安全控製係統等安全措施。門式起重機的工作原理主要基於其各個組成部分的協同作用。門式起重機主要由主梁結構、支腿、大車運行機構、起重小車及電氣部分等組成。
shouxian，diandongjitongguolianzhouqihejiansuqilianjiezaiyiqi。dangdiandongjigongzuoshi，tongguojiansuqidedisuzhoudexuanzhuanlaiqudongjuantonghediaogouyugangsishengdezuhe，shixianqigongzuo。tongguodiandongjidezhengfanfangxiangxuanzhuan，keyijiangyundongchuandigeijuantong，ranhoujuantongjianggangsishengjuanruhuofangchu，congershidediaogoudiaozhezhongwushangshenghuoxiajiang。zhezhonggongzuoyuanlishizhishangshijiangdiandongjidexuanzhuanzhuanhuaweilezhongwudeshengjiangyundong。
其次，大車運行機構負責驅動起重機在軌道上運行。這一機構由電動機、減速器、製動器和車輪等組成。當需要移動起重機時，大車運行機構會驅動起重機沿軌道移動，以便將起重小車和所吊貨物移動到需要的位置。此外，起重小車是門式起重機的起重部件，它由起升機構、運yun行xing機ji構gou和he吊diao鉤gou等deng組zu成cheng。起qi升sheng機ji構gou通tong過guo鋼gang絲si繩sheng將jiang貨huo物wu提ti起qi，然ran後hou通tong過guo運yun行xing機ji構gou將jiang貨huo物wu搬ban運yun到dao指zhi定ding位wei置zhi。在zai這zhe個ge過guo程cheng中zhong，大da車che運yun行xing機ji構gou會hui配pei合he起qi重zhong小xiao車che的de工gong作zuo，確que保bao貨huo物wu能neng夠gou被bei準zhun確que、高效地搬運到目標位置。
**，zhenggemenshiqizhongjidecaozuodoushoudaodianqibufendejingquekongzhi。dianqibufenbujintigongdongli，haifuzejiankongqizhongjideyunxingzhuangtai，quebaocaozuodeanquanhewending。